Rotary extracting apparatus



1 A24, 3 35 Pa nted Aug. 1, 1922.

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J. W. BODMAN. ROTARY EXTRACTTNG APPARATUS.

APPLICATION FILED JAN. I3. 1921- Patented Aug. 1, 1922.

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ROTARY EXTBACTING APPARATUS.

Specification of Letters Patent.

Patented Aug. 1, 1922.

To all whom it may concern:

Be it known that I, JOHN W. BonMAN, a citizen of the United States,residing at Western Springs, in the county of Cook and State ofIllinois, have invented certain new and useful Improvements in RotaryExtracting Apparatus, of which the following is a specification.

My invention relates to apparatus for extracting Soluble substances,such as grease, from various materials containing the same, by means ofsuitable solvents such as gasoline or naphtha, and recovering thesolvent. My invention is in some respects an improvement u on theapparatus described and claimed in atent Number 1,282,407, issuedOctober 22, 1918, to William E. Garrigues.

In the said patent there is described a horizontal rotary-drum in whichthe ma terial containing the soluble substance and the solvent areagitated together and the solvent with the soluble substance drawn ofi'as fully as possible. This may be accomplished by drawing off thesolution through a filter. A certain amount of the solvent, however,remains within the mass of material. A feature of the constructiondisclosed in the said patent consists in means enabling the introductionof hot gas, specifically steam, during the rotation of the drum, onlywithin that portion of the drum which is at any moment lowermost, thesteam being thus used for the recovery of the solvent remaining in themass. By thus introducing steam into the mass of material in the bottomportion of the drum, and not at all into the space within the drum abovethe material, the pressure within the mass will be greater than that inthe space above the same. Accordingly, the hot gas or steam with thevolatilized solvent and any particles of the same which may remainliquid, entrained therein, will rapidly rise from 4 the mass and passout through an axial outlet, to the condenser.

My construction provides various improvements on the type of apparatusreferred to. In the constructionof the patent referred to steam wasintroduced in the lower portion of the drum through perforated ipes, andthe drum was heated by steam w ich was circulated through series of.closed pipes, to prevent condensation within the drum of the steaminjected into the material through the perforated pipes. The enteringsteam for both series of pipes and the return connection for the closedseries of pipes, all passed through the valve construction at one end ofthe drum. I'have found with this construction that wet steam, returningfrom the closed heating system, is likely to mingle with the enteringdry steam which is to be injected within the material, which isundesirable.

With my present construction I keep the steam which is to be injectedinto the material separated at all times from the steam which isintended for maintaining the temperature of the drum, and so arrange therotating and stationary parts at and adjacent to the steam passages asto prevent the mixture of wet and dry steam. I accomplish this byproviding a'heating jacket surrounding t e drum in place of the closedpipes within the drum referred to, and providing an enclosed pocketwithin the head of the drum into which steam passes by an axial openingand from which it is led into the jacket. A smaller inlet pipe carriesthe dry steam for injection within the material in the drumthrough theinterior of the other pipe referred to and into the interior of asuitable valve construction within the drum, both pipes passing throughsuitable stufiing boxes which may readily be adjusted to take up wear.

My? improved construction also preferably provides improvements inregard to the means by which the dry steam is passed into the mass ofmaterial, the filtering means provided within the drum, and the mannerin which the volatilized solvent and steam are led from the drum, aswill more fully hereinafter appear.

In order that a clearer understanding of my invention may be hadattention is hereby tail showing the outlet of the drum, partlyshown inelevation and Fig. 4 is an enlarged vertical section through the steamNW I head and valve at'the entrance end of the drum, partly shown inelevation.

Referring to the drawings the horizontal rotary drum is illustrated at1, an outer shell 2 surrounding the same to provide a heating jacket 3,the cylindrical shells 1 and 2 being spaced apart by means of suitablerings such as those shown at 4. Suitable man holes are provided as isindicated at'5 for the introduction of the material containing thesoluble substance which is to be extracted.

-The drum is provided with heads 6 and 7 at the entrance and exit endsof the same. The drum may be provided with peripheral rails 8 which restin contact with rollers 9, the extractor having a drive gear 10 whichmeshes with a driving pinion 11.

The head 6 of the drum is preferably divided in the form of a castinghaving an outwardly extending annular flange 12 enclosmg a space orpocket 13. This is covered by an outer plate 14 which may be remov- 9.1y secured in any suitable way to the flange 12. i

A suitable valve structure is provided on the inner face of head 6. Thispreferably comprises a rotating member 15 whichtakes the form of abox-like structure having a flange or flanges 16 secured to the innerface of head 6. This may have a bearing member 17 secured within thesame to rotatetherewith. A stationary member 18, preferably of box-likeconstruction, is mounted within the rotating bearing member 17 thisstationary member being secured in position by means presently to bedescribed. Lubricants may be conducted by a's uitable pipe 19 to theadjacent surfaces of members 17, 18 and 6 at which relative rotationoccurs. Member 18 may suitably be formed of brass or other suitablebearing material.

The outer plate 14 is provided with an opening extending axially throughthe same in which astufling box is mounted comprising the gland 20 and apacking material 21. A tube 22 extends through this stufling box intothe inner pocket 13.

. An axial opening extends through the innor, portion 6 of the head 6 inalignment with the opening through plate 14 and a stuffing box ismounted in this opening, com- V prising a gland 23 and packing material24.

A plpe 25 of smaller diameter than pipe 22 extends through the interiorof pipe 22 and through the stuffing box in the portion 6 of head 6. Theinner end of pipe 25 is securely fastened to member 18 of the valve,to'hold the latter stationary, pipes 22 and 25 both being fixed inposition. Preferably the inner end of pipe 25 is threaded as isindicated at 26 and is screwed into a suitably threaded opening in theouter wall of member 18. If desired a set screw 27 may also be providedto extend. through the wall of member 18 cated connects with a tappedopening 29 which extends through flange 12 into pocket 13, pipe 28 atits other end opening in a similar manner into the jacket 3. As stated aplurality of pipes 28 may thus be provided to lead from various pointson the periphery of pocket 13 to various points around the steam jacket.

Heating fluid, preferably steam, flows through the pipe 22 into pocket13 and thence through pipe or pipes 28 into the jackt 3 so as tomaintain the drum in a heated condition to prevent the condensation ofsteam within the drum. When steam condenses in jacket 3 to a suflicientextent, the drum may be stopped and the jacket drained throughconnections 29.

The pipes for injecting the heating fluid, preferably dry steam, intothe mass of material in the drum, preferably takes the form of aplurality of spaced pipes 30, 30 which are secured in parallel spacedrelation around the periphery of the drum, by means of the supportingangle members indicated at 31. These pipes are preferably open at theirends which are farthest removed from head 6 and are of varying length asis indicated in Fig. 1' so that the steam delivered therebty will enterthe material in the drum at di ferent points lengthwise of the latter. Iconsider this construction to be preferable to the perforated pipesspecifically described in the Garrigues patent referred to for thereason that the latter tend to become clogged.

The various pipes 30 may be secured at their outer ends in bosses 32provided in head 6.

Each pipe 30 is provided with a T connection 33 from which extends apipe 34, pipes 34 extending" radially inward, their inner ends extendinginto tapped openings in the member 15 of the rotary valve, one of suchtapped openings being indicated at 35 in The stationary valve member 18has a slot or opening 36 through its bottom surface. The tapped openings35 through the outer member 15 are equally spaced around the peripheryof the latter and correspond in number to the pipes 30, pipe connections34 screwing into each of the same, bearing member 17 also havingopenings in alignment with the tapped openings 35. As the drum revolves,there will only be communication between the interior of valve member18'and a pipe 30, when the latter is adjacent to the bottom of the drum,during rotation of the latter, so that the connection '34 of the pipe 30referred to will be in alignment with slot 36. The latter may extend fora distance sulficient to enable one or two of the pipes 30, for example,to register therewith at a time. Dry steam continuously enters the spacewithin th valve through pipe 25, during the rotation of the drum, andpasses through the pipes 30 which are lowermost and 23 may readily betightened to take upany wear between the same and the pipes 22 and 25.

I also find it advisable to use a longitudinal screen or filter in placeof the vertical filter which is illustrated as extending across the exitend of the drum in the Garrigues patent referred to. Such a verticalfilter cuts off thevend portion of the drum and therefore decreases thespace within the drum which is efiective for containing the material tobe treated. Furthermore, difficulty sometimes arises because of theclogging of the vertical screen in the prior construction referred to.

Accordingly I have provided a longitudinal screen indicated at 37 assecured upon parallel longitudinal angular members 38 secured to theinner curved surface of the drum.- The filter thus extends the length ofthe drum and across the curved surface of the drum, so as to form achord of a small arc of the periphery of the drum.

The space between the filter and the adjacent curved surface of the drumis quite small and accordingly the greater portion of the interior ofthe drum is available for containing the material to be operated upon.With this construction the vapor outlet through head 7 of the drum takesthe form of a stationary pipe 39 which extends through a stuffing box 40in the head 7 of the drum. At its inner end pipe 39 is provided with asuitable connection 41 into which extends the upwardly directed pipe 42having an elbow 43 at its upper end with an inwardly directed open endportion 44. With this construction the end 44 of the outlet is alwaysabove the upper surface of material being treated in the drum. Duringthe solvent recovery operation, the vapor tension within the mass ofmaterial causes the steam to rise with a considerable por-' tlon ofvolatilized solvent and to pass outthrough pipes 44, 42, and 39, to asuitable condenser.

In the operation of the apparatus the extractor is partly filled with amaterial containing the soluble substances to be extracted, and thesolvent, preferably preheated, is continuously run in throu h pipe 25while the extractor is rotated. he rotation is then stopped, a pipe ortube connected to the draw oit connection indicated at 45,1eading to thespace between filter 37 and the adjacent peripheral surface of the drum,and the solvent with dissolved soluble substance drawn oil as fully aspossible. Connection 45 is then closed, the pipe leading therefrom beingremoved, the extractor again rotated, and steam allowed, to flow throughpipes 22 and 25, with the recovery of solvent remaining in the mass, asabove described.

What I claim-is:

1. In extracting apparatus, the combination of a horizontal rotary drumhaving a head at one end with an enclosed pocket therein, a jacketsurrounding said drum, connecting pipe means leading from said pdpket tosaid jacket, a valve comprising a rotary and a stationary member andhaving an interior space, at the inner side of sa1d head, spaced steamdelivery ipes secured within said drum, connectef to said valve to openinto said space only when they occupy the lower portion of the drum,during the rotation thereof, an axial pipe lead-, ing through the outerportion of said head into said pocket, and a pipe of smaller diameterextending through said first pipe and into said space within said valve.

2. In extracting apparatus, the combination of a horizontal rotary drumhaving a head at one end with an enclosed pocket therein, a jacketsurrounding said drum, connecting pipe means leading from said pocket tosaid jacket, a valve comprising a rotary and a stationary member andhaving1 an interior space, at the inner side of sai head, spaced steamdelivery pipes secured within said drum, connected to said valve to openinto said space only when they occupy the lower portion of the drum,during the rotation thereof, said pipes having open ends at varyingdistances from said head, a pipe leading from the exterior into saidpocket, and a pipe leading from the exterior into said space within sa1dvalve.

3. ln extracting apparatus, the combination of a horizontal rotary drumhaving a head at one end with an outwardly opening pocket therein, anouter plate secure thereto to 'cover said pocket, a jacket surroundingsaid drum, connecting pipe means leading from said ocket to said jacket,axially disposed stu ng boxes mounted in openings through said plate andthe inner portion of said head, a pipe extending through said platestufiing box'into sai pocket and a smaller pipe through said first pipeand through said inner stufiing box, a valve within said drum having amember rotating with said head extending and a stationary member andhaving an This specification signed and witnessed interior space intowhich said last. named this 6th day of December, 1920.

pipe extends and spaced delivery pipes Within said drum, connected tosaid valve JOHN BODMAN' 5 to open into said space only When they 00-Witnesses:

cupy the lower portion of the drum during 7 GUY S. BURTIs,

the rotationthereof. W. E. SANGER.

